organometallic reagents has attracted the attention of organic chemists for a long time. However limited methods are reliable for common amides and have found synthetic applications. Here we report a method featuring in situ activation of tertiary amides with triflic anhydride (Tf2O) followed by addition of Grignardreagents. The method displays a good generality in scope for both amides and Grignard reagents
Lithium amidotrihydroborate, a powerful new reductant. Transformation of tertiary amides to primary alcohols
作者:Andrew G. Myers、Bryant H. Yang、Kopecky J. David
DOI:10.1016/0040-4039(96)00652-1
日期:1996.5
Lithiumamidotrihydroborate (LiH2NBH3, LAB) is a new and highly nucleophilic reducing agent that is easily prepared by deprotonation of the commerical reagent borane-ammonia complex (H3NBH3) with n-BuLi in tetrahydrofuran (THF) at 0 °C. LAB is found to be a superior reagent for the transformation of tertiaryamides into the corresponding primaryalcohols.
We herein report amide directed enantioselective β‐C(sp3)−Hborylation of unbiased methylene C−H bonds of acyclic amides enabled by iridium catalysis for the first time. The key to the success of this transformation relies on the careful selection of the combination of iridium precursor and chiral bidentate boryl ligands. A variety of functional groups are well‐tolerated, affording chiral β‐functionalized